I unfortunatly do not have any weights on the Kosei S6c because they are no longer in our system, but from what the other salesmen here tell me they are in the mid to high 20's range. As far as the integral is concerned that is an awesome choice for you not only because it is light, but it is very strong as well. In the 17's they weigh only 18 lbs each. If the car is an E36/E46 chassis you could run the 8's up front and the 9's in the rear with a 225/45 up front and the 245/40 in the rear. If you would like to have me put it all together for you please give me a call and let me know, thanks Aaron 800.428.8355 x395